Well I would be able to give a better review if my girlfriend didn't take it from me on a cold cold night. I'll give you her feedback and compare it to my Ghost SL. I am one to believe that you should be warmer than not. The Wraith is obviously lighter but less cushion and the neck guard is much lighter that the Ghost. If you're going to do 4 season, spend a few more bucks and get the Ghost. If you're concerned about weather and weight, get the Wraith. Most people doing really reach below 40. Although depending on your sleeping pad, you can balance with the bag. I've heard of the zipper getting caught on the bag, well this is because the bag is very fluffy (a good thing). Most bag will do the same. My NorthFace 20+ gets caught too. The welded seams on with Mt Hardware is amazing. They virtually made a bag without stitching, amazing technology. That means that you can reduce on stitching and taping = very little weight but it's the details that counts. GF said that because girls get colder, she should have it. As she didn't complain in the morning, I guess it was good for me too. BTW, feather is much much more compressable than synthetic. Unless you just casually use your bag, you have to get feathers. The bird is the word.